<?php
/**
 * Smarty Internal Plugin Config
 *
 * @package Smarty
 * @subpackage Config
 * @author Uwe Tews
 */

/**
 * Smarty Internal Plugin Config
 *
 * Main class for config variables
 *
 * @package Smarty
 * @subpackage Config
 *
 * @property Smarty_Config_Source   $source
 * @property Smarty_Config_Compiled $compiled
 * @ignore
 */
class Smarty_Internal_Config {

	/**
	 * Samrty instance
	 *
	 * @var Smarty object
	 */
	public $smarty = null;
	/**
	 * Object of config var storage
	 *
	 * @var object
	 */
	public $data = null;
	/**
	 * Config resource
	 * @var string
	 */
	public $config_resource = null;
	/**
	 * Compiled config file
	 *
	 * @var string
	 */
	public $compiled_config = null;
	/**
	 * filepath of compiled config file
	 *
	 * @var string
	 */
	public $compiled_filepath = null;
	/**
	 * Filemtime of compiled config Filemtime
	 *
	 * @var int
	 */
	public $compiled_timestamp = null;
	/**
	 * flag if compiled config file is invalid and must be (re)compiled
	 * @var bool
	 */
	public $mustCompile = null;
	/**
	 * Config file compiler object
	 *
	 * @var Smarty_Internal_Config_File_Compiler object
	 */
	public $compiler_object = null;

	/**
	 * Constructor of config file object
	 *
	 * @param string $config_resource config file resource name
	 * @param Smarty $smarty Smarty instance
	 * @param object $data object for config vars storage
	 */
	public function __construct($config_resource, $smarty, $data = null)
	{
		$this->data = $data;
		$this->smarty = $smarty;
		$this->config_resource = $config_resource;
	}

	/**
	 * Returns the compiled  filepath
	 *
	 * @return string the compiled filepath
	 */
	public function getCompiledFilepath()
	{
		return $this->compiled_filepath === null ?
		($this->compiled_filepath = $this->buildCompiledFilepath()) :
		$this->compiled_filepath;
	}

	/**
	 * Get file path.
	 *
	 * @return string
	 */
	public function buildCompiledFilepath()
	{
		$_compile_id = isset($this->smarty->compile_id) ? preg_replace('![^\w\|]+!', '_', $this->smarty->compile_id) : null;
		$_flag = (int) $this->smarty->config_read_hidden + (int) $this->smarty->config_booleanize * 2
		+ (int) $this->smarty->config_overwrite * 4;
		$_filepath = sha1($this->source->name . $_flag);
		// if use_sub_dirs, break file into directories
		if ($this->smarty->use_sub_dirs) {
			$_filepath = substr($_filepath, 0, 2) . DS
			. substr($_filepath, 2, 2) . DS
			. substr($_filepath, 4, 2) . DS
			. $_filepath;
		}
		$_compile_dir_sep = $this->smarty->use_sub_dirs ? DS : '^';
		if (isset($_compile_id)) {
			$_filepath = $_compile_id . $_compile_dir_sep . $_filepath;
		}
		$_compile_dir = $this->smarty->getCompileDir();
		return $_compile_dir . $_filepath . '.' . basename($this->source->name) . '.config' . '.php';
	}

	/**
	 * Returns the timpestamp of the compiled file
	 *
	 * @return integer the file timestamp
	 */
	public function getCompiledTimestamp()
	{
		return $this->compiled_timestamp === null
		? ($this->compiled_timestamp = (file_exists($this->getCompiledFilepath())) ? filemtime($this->getCompiledFilepath()) : false)
		: $this->compiled_timestamp;
	}

	/**
	 * Returns if the current config file must be compiled
	 *
	 * It does compare the timestamps of config source and the compiled config and checks the force compile configuration
	 *
	 * @return boolean true if the file must be compiled
	 */
	public function mustCompile()
	{
		return $this->mustCompile === null ?
		$this->mustCompile = ($this->smarty->force_compile || $this->getCompiledTimestamp () === false || $this->smarty->compile_check && $this->getCompiledTimestamp () < $this->source->timestamp):
		$this->mustCompile;
	}

	/**
	 * Returns the compiled config file
	 *
	 * It checks if the config file must be compiled or just read the compiled version
	 *
	 * @return string the compiled config file
	 */
	public function getCompiledConfig()
	{
		if ($this->compiled_config === null) {
			// see if template needs compiling.
			if ($this->mustCompile()) {
				$this->compileConfigSource();
			} else {
				$this->compiled_config = file_get_contents($this->getCompiledFilepath());
			}
		}
		return $this->compiled_config;
	}

	/**
	 * Compiles the config files
	 *
	 * @throws Exception
	 */
	public function compileConfigSource()
	{
		// compile template
		if (!is_object($this->compiler_object)) {
			// load compiler
			$this->compiler_object = new Smarty_Internal_Config_File_Compiler($this->smarty);
		}
		// compile locking
		if ($this->smarty->compile_locking) {
			if ($saved_timestamp = $this->getCompiledTimestamp()) {
				touch($this->getCompiledFilepath());
			}
		}
		// call compiler
		try {
			$this->compiler_object->compileSource($this);
		} catch (Exception $e) {
			// restore old timestamp in case of error
			if ($this->smarty->compile_locking && $saved_timestamp) {
				touch($this->getCompiledFilepath(), $saved_timestamp);
			}
			throw $e;
		}
		// compiling succeded
		// write compiled template
		Smarty_Internal_Write_File::writeFile($this->getCompiledFilepath(), $this->getCompiledConfig(), $this->smarty);
	}

	/**
	 * load config variables
	 *
	 * @param mixed $sections array of section names, single section or null
	 * @param object $scope global,parent or local
	 */
	public function loadConfigVars($sections = null, $scope = 'local')
	{
		if ($this->data instanceof Smarty_Internal_Template) {
			$this->data->properties['file_dependency'][sha1($this->source->filepath)] = array($this->source->filepath, $this->source->timestamp, 'file');
		}
		if ($this->mustCompile()) {
			$this->compileConfigSource();
		}
		// pointer to scope
		if ($scope == 'local') {
			$scope_ptr = $this->data;
		} elseif ($scope == 'parent') {
			if (isset($this->data->parent)) {
				$scope_ptr = $this->data->parent;
			} else {
				$scope_ptr = $this->data;
			}
		} elseif ($scope == 'root' || $scope == 'global') {
			$scope_ptr = $this->data;
			while (isset($scope_ptr->parent)) {
				$scope_ptr = $scope_ptr->parent;
			}
		}
		$_config_vars = array();
		include($this->getCompiledFilepath());
		// copy global config vars
		foreach ($_config_vars['vars'] as $variable => $value) {
			if ($this->smarty->config_overwrite || !isset($scope_ptr->config_vars[$variable])) {
				$scope_ptr->config_vars[$variable] = $value;
			} else {
				$scope_ptr->config_vars[$variable] = array_merge((array) $scope_ptr->config_vars[$variable], (array) $value);
			}
		}
		// scan sections
		if (!empty($sections)) {
			$sections = array_flip((array) $sections);
			foreach ($_config_vars['sections'] as $this_section => $dummy) {
				if (isset($sections[$this_section])) {
					foreach ($_config_vars['sections'][$this_section]['vars'] as $variable => $value) {
						if ($this->smarty->config_overwrite || !isset($scope_ptr->config_vars[$variable])) {
							$scope_ptr->config_vars[$variable] = $value;
						} else {
							$scope_ptr->config_vars[$variable] = array_merge((array) $scope_ptr->config_vars[$variable], (array) $value);
						}
					}
				}
			}
		}
	}

	/**
	 * set Smarty property in template context
	 *
	 * @param string $property_name property name
	 * @param mixed  $value         value
	 * @throws SmartyException if $property_name is not valid
	 */
	public function __set($property_name, $value)
	{
		switch ($property_name) {
			case 'source':
			case 'compiled':
				$this->$property_name = $value;
				return;
		}

		throw new SmartyException("invalid config property '$property_name'.");
	}

	/**
	 * get Smarty property in template context
	 *
	 * @param string $property_name property name
	 * @throws SmartyException if $property_name is not valid
	 */
	public function __get($property_name)
	{
		switch ($property_name) {
			case 'source':
				if (empty($this->config_resource)) {
					throw new SmartyException("Unable to parse resource name \"{$this->config_resource}\"");
				}
				$this->source = Smarty_Resource::config($this);
				return $this->source;

			case 'compiled':
				$this->compiled = $this->source->getCompiled($this);
				return $this->compiled;
		}

		throw new SmartyException("config attribute '$property_name' does not exist.");
	}

}

?>